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i2c: xlp9xx: Add support for SMBAlert 

Add support for SMBus alert mechanism to i2c-xlp9xx driver.
The second interrupt is parsed to use for SMBus alert.
The first interrupt is the i2c controller main interrupt.

Signed-off-by: Kamlakant Patel <kamlakant.patel@cavium.com>
Signed-off-by: George Cherian <george.cherian@cavium.com>
Reviewed-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
George Cherian 2018-05-16 00:00:16 -07:00 committed by Wolfram Sang
parent 966e9671a3
commit 40f4e372cb
1 changed files with 24 additions and 0 deletions
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24
drivers/i2c/busses/i2c-xlp9xx.c
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@ -10,6 +10,7 @@
#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/i2c.h>
#include <linux/i2c-smbus.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
@ -84,6 +85,8 @@ struct xlp9xx_i2c_dev {
struct device *dev;
struct i2c_adapter adapter;
struct completion msg_complete;
struct i2c_smbus_alert_setup alert_data;
struct i2c_client *ara;
int irq;
bool msg_read;
bool len_recv;
@ -447,6 +450,19 @@ static int xlp9xx_i2c_get_frequency(struct platform_device *pdev,
return 0;
}
static int xlp9xx_i2c_smbus_setup(struct xlp9xx_i2c_dev *priv,
struct platform_device *pdev)
{
if (!priv->alert_data.irq)
return -EINVAL;
priv->ara = i2c_setup_smbus_alert(&priv->adapter, &priv->alert_data);
if (!priv->ara)
return -ENODEV;
return 0;
}
static int xlp9xx_i2c_probe(struct platform_device *pdev)
{
struct xlp9xx_i2c_dev *priv;
@ -467,6 +483,10 @@ static int xlp9xx_i2c_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "invalid irq!\n");
return priv->irq;
}
/* SMBAlert irq */
priv->alert_data.irq = platform_get_irq(pdev, 1);
if (priv->alert_data.irq <= 0)
priv->alert_data.irq = 0;
xlp9xx_i2c_get_frequency(pdev, priv);
xlp9xx_i2c_init(priv);
@ -493,6 +513,10 @@ static int xlp9xx_i2c_probe(struct platform_device *pdev)
if (err)
return err;
err = xlp9xx_i2c_smbus_setup(priv, pdev);
if (err)
dev_dbg(&pdev->dev, "No active SMBus alert %d\n", err);
platform_set_drvdata(pdev, priv);
dev_dbg(&pdev->dev, "I2C bus:%d added\n", priv->adapter.nr);